AM1750 Secondary reference PRT


AM1750 series Secondary Reference PRT provides our customers an affordable reference probe for precision temperature measurement and calibration in labs and fields. The PRT features accuracy of ±0.015°C at 0.01°C ; short term stability of ±0.007°C. Two different lengths of PRTs are available at 12-inch and 20-inch.

The sensing element is designed to protect the platinum sensing wire from contamination at high temperatures, giving the device a high level of stability and repeatability in performance. A uniquely designed support structure and filling material provides excellent balance between the hysteresis effect, mechanical shock and thermal shock performance. This high performance probe fully meets ITS-90 criteria for reference thermometers.


  • Temperature range: -200 °C to 670 °C
  • Accuracy: ±0.015 °C at 0.01°C
  • Long term drift: ±0.01 °C
  • Short term stability: 0.007 °C
  • Durable and shock resistance
  • Temperature Coefficient 0.003925
  • W(Ga)>=1.11807
  • Inconeltm sheath
  • Customized dimensions available



Temperature Range 1750-12: -200°C to 670°C
1750-20: -200°C to 670°C
Resistance at 0 °C Nominal 100 Ω
Temperature Coefficient 0.003925 Ω/ Ω/°C
Accuracy ±0.025°C at -196 °C
±0.015°C at 0.01 °C
±0.035°C at 420 °C
±0.05°C at 660 °C
Drift ±0.01°C at 0 °C after 100 hours at 660 °C
Short Term Stability ±0.007°C
Thermal Shock ±0.005°C after 10 times thermal cycles from minimum to maximum temperatures
Hysteresis <=0.005°C
Self-heating 50 mW/°C
Response Time 9 seconds for 63% response to step change in water moving at 3 feet per second
Measurement Current 0.5 mA or 1 mA
Sensor Length 32 mm
Sensor Location 5 mm from tip
Insulation Resistance >1000 MΩ at room temperature
Sheath Material Inconeltm
Dimension 1750-12: 0.25 inch X 12 inch (6.35 mm X 305 mm)
1750-20: 0.25inch X 20 inch (6.35 mm X 500 mm)
External Leads Teflontm –insulated copper wire, 4 leads, 2.5 meters
Handle Dimension 15mm (OD) X 65 mm (L)
Handle Temperature Range* -50°C to 180°C
Calibration Options 1750-12-T, PRT with NIST traceable calibration and data
1750-20-T, PRT with NIST traceable calibration and data
NVLAP – Accredited Calibrations available per request

Optional Accessories

Model Description
9001 Carrying Case for 1750-12
9002 Carrying Case for 1750-20


AM1750 brochure (PDF Download 278Kb)